Overshot



R. A. DAILEY OVERSHOT.

APPLICATION FILED on. n, 1919.

Patented Sept. 7 1920,

2 SHEETS-SHEET l llW/E/VTUR R .A.Da i [6 A TTOR/VEYS R. A. DAILEY.

OVERSHOT.

APPLICATION FILED OCT. 11, 1919.

1,351,744. Pat/gntedfiept. 7, 1920.

2 SHEETS-SHEET 2.

lNl/E/VTOR R.A.Da I: le y A TTORNEYS nor A. BA LEY, or TAFT, cnnrrormm.

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' Specification of Letters Patent. Patented Sept. 7, 1920.

Application filed October 11, 1919. Serial No. 330,006.

T 0 all whom it may concern:

Be it known that 1, Roy A. DAILEY, a citizen of the United States, and aresident of Taft, in the county of Kern and State of California, haveinvent-ed certain new and useful Improvements in Overshots, of which thefollowing is a specification.

My invention is an. improvement in overshots, and has for its object toprovide a device of the character specified, adapted for fishing brokentools from a well casing, wherein a body portion is provided havingslips or dogs for engaging the tool to hold the same, together withvarious types of interchangeable bowls for facilitating the engagementof the overshot with various characters of break.

In the drawings Figure 1 is a longitudinal section of the tool,

Fig. 2 is a top plan view,

Fig. 3 is a side view of one of the interchangeable bowls,

Fig. 1 is a longitudinal section of another yp Fig. 5 is a front view ofone of the slips.

In the present embodiment of the invention, a body portion 1 is providedof cylindrical form, and of suitable length, the said body beinginternally threaded at its upper end as indicated at 2 for engagement bymeans for operating the overshot, as for instance, pipe. At its lowerend, the body is reamed or counterbored and internally threaded as shownat 3 for engagement by the bowls to be described.

The bore of the body is enlarged intermediate the ends of the body asindicated at 4:, and a shoulder 5 is formed at the lower end of theenlarged portion whose plane is perpendicular to the axis ofthe body.The

shoulder 6 at the upper end ofthe enlarged portion is inclined as shown.Each of the slips has a plate 7 of rhomboidal form, having at the centerof the base a lug 8 which is apertured to receive a pivot pin 9 forpivotally connecting the slip to the body.

Referring to Fig. 1, it will be seen that these lugs 8 and these slipsare provided,

the said slips being arranged at angles of.

with respect to each other. Each of these slips is normally pressedtoward the center of the body by a plate spring 11 which is arrangedbetween the slip and the body, and is secured to this'slip intermediateits ends as indicated at 12, the ends/of the spring engaging the innerface of the bod The slips at their small ends are spaced apart at theiradjacent edges at angles of approximately 30, so that they offer noimpediment to the free flow of water through the overshot. A series ofbowls is provided for connection with the body, one of these bowls shownin Fig. 1, being a cylindrical structure 13 having a threaded externalreduction at its upper end for engaging within the counterbore 3. I

The lower end of this body portion has teeth 15 which are inclined withrespect to the axis of the bowl, so that they tend to move the toolinwardly toward the axis of the casing when they are engaged therewith.The bowl shown in Fig. 3 is a bell-shaped member 16 having a reducedportion 17 for engaging the body, and one side of the bowl is cut awayat the large end as indicated at 18, to permit the tool to enter thebowl laterally. The bowl 19 shown in Fig. 4. is a plain cylinder, havingits lower end reamed as shown at 20 and having its upper end reduced andscrew-threaded as shown at 21 to engage within the bowl.

When the casing is broken off unevenly, the bowl shown in Fig.1 is used,the teeth are out on an angle such that whenthe bowl is rotated, theteeth tend to force the casing to the center of the bowl. The bond shownin Fig. 3 is for use in straightening up pipe where it is leaningagainst the-side of the hollow. The bowl shown in Fig. 4 is used onsucker rod joints and on pipes which have stripped threads. v

The overshot is lowered into the well hole, and rotated over the brokenpipe. The pipe passes up through the overshot until the slips come intocontact with the coupling, and the coupling forces open the slips. Afterthe coupling passes over the slips, they are forced back beneath thecoupling, giving a firm hold on the lost pipe. The improved overshot canbe used to catch sucker rod joints where the rod has stripped thethread, broken off or come unscrewed.

Any style of bowl can be used, and when between the slips permits thewater to be pumped down to wash'away the mud allowing the slips to workmore freely. Since the slips are hinged, when they come in con tactWithshvers on the pipe, they are forced back against the body of theovershot.

I claim An overshot fishing tool comprising a oylindrical body,a'plurelity of rhomboidal slips disposed therein and tapering up wardlyend having their upper edges formed with arcuate depressions, an 1nte-"body.

passing through said lugs and pivoting the slips, and a plate springsecured externallyto each slip and engaging the wall of the ROY DAILEY.

